Thanks for the reply Daryl. I agree re trail boss. As I mentioned, I already load for 45-120 (or .45 3-1/4") and I agree with your comments. Fillers are often necessary, but they really aren't all that much trouble. Slow powders help.

4seventy: Huh? I have the choice of either loading to the same pressure as a .45-70 with better performance, or loading to the same performance with less pressure. What's so difficult to understand?

500Nitro: Huh? Why cut down valuable brass? The extra costs also involve new dies, different powders etc etc. What cost of reaming? I can have it done for zeeeeeero cost, as I said I already have a reamer.